﻿using Caliburn.Micro;
using Phones.Client.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.ComponentModel.Composition.Primitives;

namespace Phones.Client
{
    public class AppBootstrapper : Bootstrapper<MainViewModel>
    {
        private CompositionContainer container;

        protected override void Configure()
        {
            var config = new TypeMappingConfiguration
            {
                DefaultSubNamespaceForViews = "View",
                DefaultSubNamespaceForViewModels = "ViewModel"
            };
            ViewLocator.ConfigureTypeMappings(config);
            ViewModelLocator.ConfigureTypeMappings(config);

            container = new CompositionContainer(
                new AggregateCatalog(
                    AssemblySource.Instance.Select(
                        x => new AssemblyCatalog(x))
                            .OfType<ComposablePartCatalog>()
                    ));

            CompositionBatch batch = new CompositionBatch();

            batch.AddExportedValue<IWindowManager>(new WindowManager());
            batch.AddExportedValue<IEventAggregator>(new EventAggregator());
            batch.AddExportedValue(container);

            container.Compose(batch);
        }

        protected override object GetInstance(Type serviceType, string key)
        {
            string contract = string.IsNullOrEmpty(key) ?
                AttributedModelServices.GetContractName(serviceType) : key;
            var exports = container.GetExportedValues<object>(contract);

            if (exports.Count() > 0)
            {
                return exports.First();
            }

            throw new Exception(
                string.Format(
                    "Could not locate any instances of contract {0}.",
                    contract));
        }

        protected override IEnumerable<object> GetAllInstances(Type serviceType)
        {
            return container.GetExportedValues<object>(
                    AttributedModelServices.GetContractName(serviceType)
                );
        }

        protected override void BuildUp(object instance)
        {
            container.SatisfyImportsOnce(instance);
        }
    }
}
